Push button motion indicator mechanism

A method of indicating motion, comprising:

• locating a plunger of a position indicator, the plunger disposed in a housing and extending from a first housing end of the housing and axially movable relative to the housing, the plunger biased into an axially extended position relative to the housing via a plunger biasing element;
• urging the plunger toward a retracted position by applying an axial force to a plunger tip of the plunger;
• releasing a retaining assembly of a push button disposed in the housing via movement of the plunger toward the retracted position, the push button disposed at a second housing end of the housing and axially moveable relative to the housing, the push button biased toward an axially extended position relative to the housing via a button biasing element;
• and
• urging the push button toward the axially extended position via the button biasing element thereby indicating a detected axial displacement of the plunger;
• wherein the housing includes:
• an outer sleeve;
• and
• and an inner sleeve disposed radially inboard of the outer sleeve;
• and
• further comprising positioning the push button radially between the outer sleeve and the inner sleeve;
• and
• locating the inner sleeve radially between the plunger and the push button;
• wherein the retaining assembly includes one or more retaining balls disposed in a ball opening in the inner sleeve;
• and
• retaining the push button in the retracted position via interaction between one or more retaining elements extending radially inwardly from the housing and the one or more retaining balls;
• wherein the plunger includes a pocket configured such that, when the plunger is urged toward a retracted position, the retaining balls are free to move radially inwardly into said pocket, thereby releasing the push button and allowing the button biasing element to urge the push button toward the axially extended position.

A control surface actuation system, comprising:

• an actuator operably connected to a control surface:
• a jam detecting apparatus of the actuator including an actuator sleeve configured to move axially along an actuator housing when the actuator is subjected to one of an overtorque or jam condition;
• a jam indicator in operable communication with the actuator sleeve, the jam indicator including:
• an indicator housing;
• a plunger extending from a first housing end of the indicator housing and axially movable relative to the indicator housing, the plunger biased into an axially extended position relative to the indicator housing via a plunger biasing element, the plunger configured to be axially displaced via an axial force applied to a plunger tip;
• a push button disposed at a second housing end of the indicator housing and axially moveable relative to the indicator housing, the push button biased toward an axially extended position relative to the
• indicator housing via a button biasing element;
• a retaining assembly configured to retain the push button in an axially retracted position relative to the indicator housing;
• wherein the retaining assembly is configured to release the push button and allow the button biasing element to urge the push button toward the axially extended position when the plunger is urged toward a retracted position via via the axial force applied to the plunger tip, thereby indicating that the actuator has been subjected to one of an overtorque or jam condition;
• wherein the indicator housing includes:
• an outer sleeve;
• and
• an inner sleeve disposed radially inboard of the outer sleeve:
• wherein the push button is located radially between the outer sleeve and the inner sleeve;
• and
• wherein the inner sleeve is located radially between the plunger and the push button;
• wherein the retaining assembly includes:
• one or more retaining balls disposed in a ball opening in the inner sleeve;
• and
• one or more retaining elements extending radially inwardly from the indicator housing to interact with the one or more retaining balls and retain the push button in the retracted position;
• wherein the plunger includes a pocket configured such that, when the plunger is urged toward a retracted position, the retaining balls are free to move radially inwardly into said pocket, thereby releasing the push button and allowing the button biasing element to urge the push button toward the axially extended position.